Merge pull request #62 from edwinst/master

A couple of edits for "Sets, Bags, and Mixes"

lib/Language/setbagmix.pod

@@ -82,7 +82,7 @@ only C<Set> arguments.
     multi sub infix:<(elem)>($a, Any $b --> Bool)
     multi sub infix:<(elem)>($a, Set $b --> Bool)
 
-Returns C<True> if C<$a> is an B<element> of C<$b> as an element.
+Returns C<True> if C<$a> is an B<element> of C<$b>.
 
 =head4 infix ∈
 
@@ -257,15 +257,14 @@ Equivalent to L«(V<|>)».
     only sub infix:<(&)>(**@p)
 
 Returns the B<intersection> of all of its arguments. Generally, this creates
-a new C<Set> that contains only the elements that all of its arguments
-contain.
+a new C<Set> that contains only the elements common to all of the arguments.
 
     <a b c> (&) <b c d> === set <b c>
     <a b c d> (&) <b c d e> (&) <c d e f> === set <c d>
 
-If any of its arguments are C<Baggy>, this creates a new C<Bag> that
-contains only the elements that all of the arguments contain, each weighted
-by the maximum weight all of the arguments share for that element.
+If any of the arguments are C<Baggy>, the result is a new C<Bag> containing
+the common elements, each weighted by the largest I<common> weight (which
+is the minimum of the weights of that element over all arguments).
 
     bag(<a a b c a>) (&) bag(<a a b c c>) === bag(<a a b c>)